The correct option is (c) 1 and 3 only.
Explanation
Dietary fibres, commonly referred to as roughage, are indigestible carbohydrates found in plant-based foods. They play a crucial role in the digestive system by adding bulk to the diet and facilitating the movement of food through the alimentary canal.- Statement 1 is Correct: Dietary fibres are also known as roughage. They consist of cellulose and other plant components that human enzymes cannot digest.
- Statement 2 is Incorrect: Roughage is mainly provided by plant products such as whole grains, pulses, potatoes, fresh fruits, and vegetables. Animal products like milk, eggs, and meat do not contain dietary fibre.
- Statement 3 is Correct: Dietary fibres do not provide any essential nutrients (such as vitamins, minerals, proteins, or fats) to the human body. However, they are an essential component of food because they add bulk, help the body get rid of undigested food, and prevent constipation.
Key Takeaway: Dietary fibres (roughage) are exclusively plant-based components that provide no nutritional value but are essential for maintaining a healthy digestive system and preventing constipation.